TY - JOUR
T1 - Kaon tagging at 0° scattering angle for high-resolution decay-pion spectroscopy
AU - Esser, Anselm
AU - Achenbach, Patrick
AU - Arai, Naoki
AU - Gayoso, Carlos Ayerbe
AU - Böhm, Ralph
AU - Borodina, Olga
AU - Bosnar, Damir
AU - Bozkurt, Vakkas
AU - Debenjak, Luka
AU - Distler, Michael O.
AU - Friščić, Ivica
AU - Fujii, Yu
AU - Gogami, Toshiyuki
AU - Rodríguez, Mar Gómez
AU - Hashimoto, Osamu
AU - Hirose, Satoshi
AU - Kanda, Hiroki
AU - Kaneta, Masashi
AU - Kim, Eunhee
AU - Kusaka, Junichiro
AU - Maeda, Kazushige
AU - Margaryan, Amur
AU - Merkel, Harald
AU - Müller, Ulrich
AU - Nagao, Sho
AU - Nakamura, Satoshi
AU - Pochodzalla, Josef
AU - Rappold, Christophe
AU - Reinhold, Joerg
AU - Saito, Takehiko R.
AU - Lorente, Alicia Sanchez
AU - Majos, Salvador Sánchez
AU - Schlimme, Björn Sören
AU - Schoth, Matthias
AU - Schulz, Florian
AU - Sfienti, Concettina
AU - Širca, Simon
AU - Tang, Liguang
AU - Thiel, Michaela
AU - Tsukada, Kyo
PY - 2014
Y1 - 2014
N2 - At the Mainz Microtron hypernuclei can be studied by (e,e'K) reactions. By detecting the kaon which is emitted in forward direction, with the KAOS spectrometer placed at 0° scattering angle, reactions involving open strangeness production are tagged. High-resolution magnetic spectrometers are then used to coincidentally detect the monoenergetic decay-pions from mesonic two-body weak decays of light hypernuclei at rest. As a pioneering experiment has confirmed, the KAOS spectrometer is exposed to a large flux of background particles, mostly positrons from bremsstrahlung pair production. In order to increase the effciency of kaon identification the KAOS spectrometer was modified to suppress background particles at the cost of a high momentum resolution, which is less important for this experiment. This was achieved by placing up to 14 cm of lead absorbers in front of the detectors, in which positrons are blocked by forming electromagnetic showers while the effect on kaons is limited. An additional time-of-flight wall and a new threshold Čerenkov detector help to increase the detection effciency of kaons.
AB - At the Mainz Microtron hypernuclei can be studied by (e,e'K) reactions. By detecting the kaon which is emitted in forward direction, with the KAOS spectrometer placed at 0° scattering angle, reactions involving open strangeness production are tagged. High-resolution magnetic spectrometers are then used to coincidentally detect the monoenergetic decay-pions from mesonic two-body weak decays of light hypernuclei at rest. As a pioneering experiment has confirmed, the KAOS spectrometer is exposed to a large flux of background particles, mostly positrons from bremsstrahlung pair production. In order to increase the effciency of kaon identification the KAOS spectrometer was modified to suppress background particles at the cost of a high momentum resolution, which is less important for this experiment. This was achieved by placing up to 14 cm of lead absorbers in front of the detectors, in which positrons are blocked by forming electromagnetic showers while the effect on kaons is limited. An additional time-of-flight wall and a new threshold Čerenkov detector help to increase the detection effciency of kaons.
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U2 - 10.1051/epjconf/20146611011
DO - 10.1051/epjconf/20146611011
M3 - Conference article
AN - SCOPUS:84898755484
SN - 2101-6275
VL - 66
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
M1 - 11011
T2 - 2013 International Nuclear Physics Conference, INPC 2013
Y2 - 2 June 2013 through 7 June 2013
ER -